Journal
SCIENCE
Volume 318, Issue 5855, Pages 1472-1475Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1149276
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Funding
- British Heart Foundation [PG/03/123/16102] Funding Source: Medline
- NIDDK NIH HHS [R01 DK062283] Funding Source: Medline
- Wellcome Trust [064920] Funding Source: Medline
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JAM-C is an adhesion molecule that is expressed on cells within the vascular compartment and epithelial cells and, to date, has been largely studied in the context of inflammatory events. Using immunolabeling procedures in conjunction with confocal and electron microscopy, we show here that JAM-C is also expressed in peripheral nerves and that this expression is localized to Schwann cells at junctions between adjoining myelin end loops. Sciatic nerves from JAM-C-deficient [having the JAM-C gene knocked out (KO)] mice exhibited loss of integrity of the myelin sheath and defective nerve conduction as indicated by morphological and electrophysiological studies, respectively. In addition, behavioral tests showed motor abnormalities in the KO animals. JAM-C was also expressed in human sural nerves with an expression profile similar to that seen in mice. These results demonstrate that JAM-C is a component of the autotypic junctional attachments of Schwann cells and plays an important role in maintaining the integrity and function of myelinated peripheral nerves.
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